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@Christoph: my last generation with icpc was done with the following configure (on a tree-copy of the smp sources, as extracted for my gnu-compile of smp, at #5480, with just a 3 changes (local/declare) in benchmark.cpp to be able to run it.)

(it is now dynamic link, allowing usage of SDL to view the render in progress)

It seems that: icc generates code that detects the brand of processor on which it is executing. On Intel CPUs, the binary will execute with SSE instructions, whereas it will execute 386 level instructions on AMD CPUs regardless of availability of SSE instruction sets.

If that's true, is there any interest to run icpc compiled povray on AMD ?

I suspect the information on that gentoo page might be outdated; at any rate I found the ICPC-compiled binaries to render a bit faster on average than the GCC-compiled ones, even on the Phenom X4 machine.